Merry Christmas! Citizen on sale
- Thread starter CobKits
- Start date
CobKits
Well-Known Member
if it has a 12V fan, yup
BecauseIgotHigh
Well-Known Member
Could you post up what variety of drivers to power these chips? Deciding whether to stay with 3590 or upgrade, but don't know the new numbers.
Seriousbuds
Active Member
What a time to be alive.
Just looking at your site. Curious.
From the HLG120H-48A page you have this:
rated current: 2.5A Max current: 2.95A can power the following combination of COBs:
Citizen:
2 1212@ 54.5W each (109W max), [email protected] ea (105W max) , 4@ 25.6W ea (102W max), etc.
2 1818@ 78.5W each (157W max) or 3@ 50.7W ea (152W max), 4@ 37.4W ea (150W max), etc.
2 1825@ 76.4W each (153W max) or 3@ 49.7W ea (149W max), 4@ 36.8W ea (147W max)
Cree:
2 3590@ 76W each (152W max) or [email protected] ea (149W max) or 4@ 36W (144W)
2 3070@ 79W each (158W max) or 3@ 50.5W ea (152W max) or 4@ 37W (148W)
I know this is YOUR recommendation but why? You are stating that you can drive 150+w from this driver but it is only rated @ 120w?
From the HLG120H-48A page you have this:
rated current: 2.5A Max current: 2.95A can power the following combination of COBs:
Citizen:
2 1212@ 54.5W each (109W max), [email protected] ea (105W max) , 4@ 25.6W ea (102W max), etc.
2 1818@ 78.5W each (157W max) or 3@ 50.7W ea (152W max), 4@ 37.4W ea (150W max), etc.
2 1825@ 76.4W each (153W max) or 3@ 49.7W ea (149W max), 4@ 36.8W ea (147W max)
Cree:
2 3590@ 76W each (152W max) or [email protected] ea (149W max) or 4@ 36W (144W)
2 3070@ 79W each (158W max) or 3@ 50.5W ea (152W max) or 4@ 37W (148W)
I know this is YOUR recommendation but why? You are stating that you can drive 150+w from this driver but it is only rated @ 120w?
AtterStiga
Well-Known Member
The datasheet http://cobkits.com/wp-content/uploads/2016/08/HLG-120H-SPEC.pdf
It is 2.5A total power 120w... If you put 3 1212clu048...it must be 2.5/3 =0,83A each 29w = 29x3=87w...72.5% Maybe im wrong..
CobKits
Well-Known Member
there are literally hundreds of drivers that can run these chips, im not sure i have time to post them all
1212s are ~34-37V and basically you can fit as many as cxbs on the same driver. not sure 1212s are an "upgrade" (while great to add i wouldnt replace cxbs with them)
1818 and 1825 are ~50-55V so you fit that many less on a driver. so if you have say 220V available on your driver youd get 4 50V cobs on there as opposed to 6 36V cobs
heres a good place to start:
https://www.rollitup.org/t/matching-drivers-and-cobs.883866/
start there and if you come up with any specific questions we'll be happy to help.
the HLG-185H-48A is the most popular driver on my site because its cheap, flexible and the math is easy. it runs up to 53.5V and is perfect for the 50V cobs. You have 4.2A to split between whatever cobs you connect to it (in parallel). so 2 cobs at 2.1A each, 3 cobs at 1.4A each, 4 cobs at 1.05A each, 10 cobs at 420 mA, etc.
Well aware of that thread and how to figure what driver can run what.
My question is, why the transparency on your sales page? On the HLG120-48A page, you say you can drive more than 150w of lighting. Read the page for yourself. Even at "max current", the HLG120 cannot provide those numbers. Very misleading and to the noob who does not know and takes recommendations from your sales page, it can be a costly mistake.
CobKits
Well-Known Member
ive only got a few 4000k. i dont stock cree, i gave up I sell maybe one chip for every 100 citizens, too expensive to stock to watch them sit on the shelfNo cree?
Oh, wall draw... Because that is the same as actual power to the cobs. Please show me where someone is delivering those numbers to the actual cob. I am running lower than 50c and my 185s arent putting out those numbers. Maybe at the wall yes, not actual delivered to the cob.
By all means, throw a multimeter on it and show us. 185h-c1400b is what I am running.
Just because you lower the TCase does not mean it provides more power. It has a max power rating (with an acceptable tolerance). If you hit 80c+, you begin to lose efficiency and drop output (and longevity). It does not mean you get an extra 10% power. Like I said, I draw 222w @ the wall with my HLG185-C1400B drivers. That does not mean I am outputting more than 200w DC side. It takes electricity to power the driver itself and convert to DC power.
Im assuming if you have a 120h putting out 157w that youd be pulling about 175w at the wall. 158w on a 120h is an increase of 30% over rated power....... To boot, this would not be a guarantee with every driver even if this is happening (which I doubt it is with any of them) so to market them as that is just false advertising and bullshit (just like our blurple epistar friends).
Just because you lower the TCase does not mean it provides more power. It has a max power rating (with an acceptable tolerance). If you hit 80c+, you begin to lose efficiency and drop output (and longevity). It does not mean you get an extra 10% power. Like I said, I draw 222w @ the wall with my HLG185-C1400B drivers. That does not mean I am outputting more than 200w DC side. It takes electricity to power the driver itself and convert to DC power.
Im assuming if you have a 120h putting out 157w that youd be pulling about 175w at the wall. 158w on a 120h is an increase of 30% over rated power....... To boot, this would not be a guarantee with every driver even if this is happening (which I doubt it is with any of them) so to market them as that is just false advertising and bullshit (just like our blurple epistar friends).
CobKits
Well-Known Member
sounds about right. its almost impossible to fill out the voltage on a constant current driver. the 50V cobs fill a 48V driver to near the limit which is a fortunate coincidence
if you were running your constant current driver to the absolute limit with cobs at a perfect 35.75 V youd have 143V x 1.56A = 223W on the cob side
if youre running crees at typical 70C Tj youre prob pulling 34V per cob or 136V x 1.56A = 212W on cob side
if your potentiometer isnt bypassable youre prob only getting 1.4A so youre at 136V x 1.4A = 190W on cob side
at the 94% efficient your ~210W on the dc side is ~222 on the AC side. easily verifiable with a meter